Door Handle Electrode Layout for Uniform Touch Detection
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Solution Overview
Problem
Existing door handles with electrostatic sensors face reduced detection sensitivity due to varying distances between the sensor electrode and the inner surface, leading to inaccurate detection of hand contact at peripheral portions, especially when the distance increases.
Innovation Solution
The door handle incorporates an electrostatic sensor with a detection electrode whose width gradually increases towards the ends, maintaining consistent detection sensitivity across the inner surface, regardless of contact location, by adjusting the electrode area to compensate for distance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electrostatic sensor uses a conventional electrode with uniform width, then the manufacturing process is simple, but the detection sensitivity varies at different locations (peripheral portions have reduced sensitivity due to increased distance from the inner surface)
Solution Approach 1:
The detection electrode is designed with non-uniform width where peripheral portions have greater width than the middle portion. This local variation in electrode geometry compensates for the increased distance from the inner surface at peripheral areas, maintaining consistent detection sensitivity across the entire electrode surface without requiring complex manufacturing processes.
2Reliability
If the electrode area is increased at peripheral portions to compensate for distance variations, then detection sensitivity is maintained, but the overall electrode structure becomes more complex
Solution Approach 1:
The electrode width parameter is varied across different regions of the detection electrode. By increasing the width at peripheral portions where the distance to the inner surface is greater, the electrode area is optimized locally to maintain consistent capacitive coupling and detection accuracy across the entire sensor surface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures accurate detection of hand contact on the door handle's inner surface, maintaining sensitivity similar to the middle portion even at peripheral areas with increased distance, without increasing manufacturing costs or complexity.
Implementation Method 1
an electrostatic sensor or the like used in detection through a hand operation is provided within the door handle
Implementation Method 2
The electrostatic sensor includes a detection electrode that is formed of a flat conductor plate, or that is formed on a surface of a flat substrate or within a flat substrate
Data Source
AI summary
A door handle includes a door handle case and an electrostatic sensor provided in the door handle case. The electrostatic sensor includes a detection electrode that is formed of a flat conductor plate, or that is formed on a surface of a flat substrate or within a flat substrate. The detection electrode includes a middle portion in a longitudinal direction of the detection electrode and includes peripheral portions proximal to both end portions of the detection electrode in the longitudinal direction. For a width of the detection electrode in a direction perpendicular to the longitudinal direction, each peripheral portion is wider than the middle portion, and the width of the detection electrode gradually increases toward each end portion in the longitudinal direction.